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Sesquiterpenquinone, cyclozonarone (1), isolated from Dictyopteris undulata 1 , has proven antifeedant activity against abalones. The enantiomer of natural cyclozonarone ((+)-2) has shown activity against epimastigotes of Trypanosoma Cruzi 2 , protozoo responsible for the Chagas disease. We have synthesized (+)cyclozonarone (2) in a previous work 3 . The important bioactivity of these sesquiterpenquinones aroused our interest in the synthesis of both epimers of 7hydroxycyclozonarone (3 and 4) and chlorinated derivatives (5).

Partial synthesis of 7a and 7b-hydroxy-ent-cyclozonarone and 7-hydroxy-chlorocyclozonarones derivatives